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Round|Lab Grown|IGI

8.31ct G SI1 Round Lab Grown Diamond

ID • G/SI1 • IGI LG595371329

Shape and cutting style on the report: Round brilliant

Certificate IGI LG595371329

Diamond specifications and retailer prices

From $2,046 NZD
$1,153 USD
As of November 1, 2026
Save $7,578 NZD (79%) vs most expensive(unlock to see where)
15 retailers carry this diamond
Most expensive: $9,624 NZD at Blue Nile · As of October 31, 2026
View at Blue Nile

About this 8.31ct lab-grown round diamond

This 8.31ct lab-grown round sits in the over five carat band, graded G colour (near-colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by IGI LG595371329 or 595371329. Listed at 15 retailers as of October 31, 2026, with prices from $2,046 to $9,624, a $7,578 spread on the same certified stone. Blue Nile lists it at $9,624. SI-grade stones are eye-clean roughly 60 to 70% of the time at this carat range. Check the inclusion plot on the cert and ask the retailer for high-resolution video before buying.

The 4Cs

8.31
Carat
G
Colour
SI1
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle35.5°
Pavilion angle40.6°
OriginLab Grown
Grading LabIGI
CertificateIGI LG595371329
Dimensions13.00 × 12.92 × 7.98 mm
L/W Ratio1.01
Girdle conditionFaceted
Culet sizePointed
Top View
13.00 mm12.92 mm8.31 ctG / SI1
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG595371329
Side View
Table 57.0%Crown 35.5°Girdle: MED-STKPavilion 40.6°Culet: NoneDepth 61.5%

Caratlytics Score

How it works →
A
Excellent
Excellent quality and great value
Unlock full score analysis
See the detailed 0 to 100 score with Quality, Value, Certification & Market breakdown

Price History

Last verified: Nov 1
Current: $9,624 NZD|Low: $1,785 NZD|High: $9,624 NZD|Avg: $4,066 NZD
Blue Nile
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
Retailer 12
Retailer 13
Retailer 14
Retailer 15
Retailer 16
Retailer 17
November 2, 2026
Retailer 8$2,000 NZD
Retailer 4$2,046 NZD
Retailer 9$2,071 NZD
Retailer 12$2,227 NZD
Retailer 17$2,374 NZD
Retailer 16$2,413 NZD
Retailer 11$2,679 NZD
Retailer 6$3,329 NZD
Retailer 10$3,383 NZD
Retailer 2$3,429 NZD
Retailer 5$3,769 NZD
Retailer 3$4,448 NZD
Retailer 13$4,677 NZD
Retailer 15$7,666 NZD
Retailer 14$8,465 NZD
Retailer 7$9,581 NZD
Blue Nile$9,624 NZD

41 data points across 17 retailers

15 retailers$2,046 NZD to $9,624 NZD

A
Cheapest Retailer
-
$2,046 NZD
$1,153 USD
A
Retailer 2
-
$2,227 NZD
$1,255 USD
View
A
Retailer 3
-
$2,374 NZD
$1,338 USD
View
Retailer 4
-
$2,413 NZD
£1,071 GBP
View
Price last confirmed 16 days ago
A
Retailer 5
-
$2,679 NZD
$1,510 USD
View
B+
Retailer 6
-
$3,329 NZD
$1,876 USD
View
B+
Retailer 7
-
$3,383 NZD
€1,816 EUR
View
B+
Retailer 8
-
$3,429 NZD
£1,522 GBP
View
B+
Retailer 9
-
$3,769 NZD
$2,124 USD
View
B+
Retailer 10
-
$4,448 NZD
$2,507 USD
View
B+
Retailer 11
-
$4,677 NZD
$2,636 USD
View
B
Retailer 12
-
$7,666 NZD
£3,402 GBP
View
B
Retailer 13
-
$8,465 NZD
$4,771 USD
View
B
Retailer 14
-
$9,581 NZD
$5,400 USD
View
Most Expensive
B
Blue Nile
25246920 · Oct 31
$9,624 NZD
$5,424 USD
View
14 more retailers have this diamond
Prices start from $2,046 NZDSave up to $7,578 NZD

Carat Hunter is not affiliated with, endorsed by, or sponsored by any retailer listed. Retailer information is from publicly available sources and may not be current. Verify details directly with the retailer before purchasing. Return terms as we hold them. Check the retailer's own returns page before you buy.

A
8.31ct Round
$2,046 NZD